【作者】 吕文菊；

【导师】 张宝诚；

【作者基本信息】 沈阳航空工业学院 ， 航空宇航推进理论与工程， 2007， 硕士

【摘要】 本文深入调研了国内外航空发动机燃烧室掺混区的研究概况，概述了掺混区研究的主要方法、现状及其发展趋势，详细论述了燃烧室掺混区的基本问题和燃烧室中三维两相燃烧模拟的理论基础、数值计算方法。采用Fluent6.2软件对某型机的慢车状态、高空小平飞状态、中间状态、最大热负荷状态、最大状态进行三维两相湍流燃烧的掺混区速度场、温度场、油滴轨迹的数值模拟计算。通过对计算结果的分析及与试验结果的比较，研究了掺混区的特性。分析指出：掺混区的冷、热区决定出口温场的冷、热区，掺混区主要起降温均温作用，可提高出口温场均匀度20％以上，明显降低高温区，对于主要工作状态一般可达400K以上；掺混区燃烧效率对燃烧室效率有一定的影响，对于主要工作状态可提高6％以上；高负荷状态的速度场均很相似；随状态负荷的增加，油滴轨迹呈减小趋势。上述结果与试验结果及燃烧室工作特点比较吻合，由此证明了该数值模拟计算的合理性和可行性。更多还原

【Abstract】 The aspects of the investigation of aeroengine combustor dilution zone at home and abroad is very deeply examined in this paper, the main methods, its status and developmental trend are presented here. The basic problems of dilution zone, the theoretical base and numerical calculation method of 3D two-phase turbulence combustion are described in detail. This paper utilizes commercial software FLUENT6.2 to numerically simulate and calculate velocity field, temperature field in dilution zone and droplet track under the 3D two phase turbulent combustion for the ground idling, the altitude-small lever flying, the middling, the peak heat load and the peak conditions. By analyzing the calculation results and comparing with tests, the characters of dilution zone is well investigated. The analysis indicates that the cold-thermal zones of dilution zone determines the cold-heat zones of the temperature field at the combustor outlet; The primary function of dilution zone are deduce and equimlibium tempreture, at the same time, it can improve the uniformity of the temperature field at the combustor outlet exceed 20% and depress high tempreture zone obviously, generally the reducing quantity of tempreture exceeds 400K at major operational conditions; the burning efficiency of dilution zone influences on the burning efficiencies of the combustor, for major operational conditions the increase in burning efficiencies can exceed 6%.The velocity fields at high load level conditions are very similar; with increasing of the load, the droplet tracks show a reduction tendency. The mentioned results fit the testing results and combustor operating performances well, and it demonstrate the reasonableness and feasibility of this numerical simulation.更多还原